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<head>
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    <title>下拉式导航</title>
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<body>
    <ul class="a12345">
        <li class="a12345">
            <a href="#" class="actvte">
                博客
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        <li class="a12345">
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                编写
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            <div class="dropdown">
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                    吐槽
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                <div class="dropbtn-content">
                    <a href="#">加拿大炮王I</a>
                    <a href="#">加拿大炮王II</a>
                    <a href="#">加拿大炮王III</a>
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        <li class="a12345" style="float: right">
            <a href="#">
                关于
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